Garland a welbilt company built to lead... Built to last service manual the “master” gas convection ovens models covered in this manual are: mco-gs-10m: m aster c onvection oven - g as s tandard d epth -(10)s ingle d eck manual c ontrol mco-gs-10e: m aster c onvection o ven - g as s tandard d epth -...
2 this service manual is designed to answer questions related to model operational requirements, troubleshooting and disassembly/assembly procedures. It contains electronic ignition operation, trouble- shooting and electronic control operations that include diagnostic codes, ladder diagrams, wire di...
3 section 3: component access of functional components.................................. 16 door gasket replacement............................................................................................................................ 17 to remove doors from the oven...............................
4 gas convection oven "gas specifications” total main burner orifice pilot pilot orifice gas pres. W/c b.T.U.'s orifice amt. Orifice amt. Nat pro nat pro nat pro * ** mco 40,000 5 / 64 ” (.0781”) #55 2 .020" .012" 1 4.5" 5.0” 10.0" mco 60,000 5 / 64 ” (.0781”) #55 3 .020" .012" 1 4.5" 5.1” 10.0" mco...
5 understanding the sequence of operation is necessary in properly trouble-shooting this appliance. In this section the sequence of operation will be covered first, as well as calibration and operation of components, and basic trouble shooting techniques for that specific model. Follow each sequence...
6 a thermocouple type test instrument is preferred for measuring oven temperatures accurately. Mercury thermometers are acceptable providing they can be proven accurate. Regardless of the type instrument used, it is most desirable to double-check it just before making an oven temperature check. This...
7 five times doubling the thickness with each fold. After the fifth fold, place the thermocouple tip in the center of the aluminum piece and fold once more. Finally, fold in the sides so that the foil clings to the thermocouple tip. A mercury thermometer can be weighted in much the same way by wrapp...
8 electronic controls - “e” sequence of operation (with the oven doors closed) 1. Line voltage is supplied to the mode switch, door switch and the momentary light switch. 2. Set mode switch to cook and close the oven doors. Line voltage is sent from mode switch to power up the controller and to the ...
9 electronic control failure codes the garland digital control has a self-diagnostic program. If a problem occurs within the digital controller, you may see one of the "f" codes. Below is a listing of the "f" codes with explanations: -f1- relay output is enabled when not cooking. If this failure cod...
10 the controller needs voltage to operate and is capable of operating on three (3) different line voltages, 115 vac, 208 vac, 240 vac. On the back of the robertshaw com6000 there are several ¼” male spade terminal or pin connections. The below is a drawing of the rear of a robertshaw com6000 contro...
11 the user preference offset is designed to enable the user to adjust the controlling temperature. There are two different styles of controllers used by garland at the present time. They are the robertshaw com6000 and com6700 series. To determine which of the controllers you are working on, look at...
12 entry exit upo - user preference offset. Used by the user to adjust the controlling temperature +/- 50º in 1º increments. 1. Set the time digits to 00:00. 2. Set the temperature digits to x10º. 3. Depress & hold the start button for five seconds. 4. “upo” & current upo will be displayed. Turn tem...
13 the safety lockout timer circuit starts timing the moment the trial for pilot ignition starts. When the timing period runs out, the trial for ignition ends, and the control module goes into lockout. Before another attempt to start can be made, the s86 must be reset. Reset by adjusting the thermos...
14 and answering conditions in each box encountered, until a problem and/or the repair is explained. After any maintenance or repair, the trouble shooting sequence should be repeated until the trouble shooting procedure ends with a normal system operation. S86 checkout and trouble shooting start not...
15 check grounding a common ground is required for the pilot burner, the ignitor-sensor, the gnd terminal of the s86, and the main burner. The main burner generally serves as the common ground. If the ground is poor or erratic, safety shutdowns may occur occasionally even though operation is normal ...
16 appearance cause small blue flame check for lack of gas from: • clogged orifice filter • clogged pilot filter • low gas supply pressure • pilot adjustment at minimum lazy yellow flame check for lack of air from: • large orifice • dirty lint screen, if used • dirty primary air opening, if there is...
17 this section will give you the best way to access component for replacement. Component locations: top front center door chain door catch right front control panel 24v transformer, ignition module redundant gas valve lower front door micro-switch data plate, burner package inside oven oven convect...
18 2. Locate stainless steel door gasket, mounted to oven front frame. 3. Remove the #10 phillips sheet metal screw that attach the retainer to the oven's front frame. 4. Remove stainless steel door gasket. 5. Replace stainless steel door gasket and to reverse above procedure to re-install. File nam...
19 2. Remove door chain assembly (note: the “a” model does not come equipped with door chain). 3. Remove flat head metal screw 1/4”-20x1/2” from bearing retainer. 4. Push the door toward hinge and lift up. Note: bottom bearing retainer will stay in place. 5. Remove the right door in the same manner....
20 1 2 3 4 7 5 7 8 6 notice: dependent door shown 7 to disassemble left door: 1. Once the door has been removed from the oven (refer to instructions on the previous page), remove the 12 truss head 10 x ½ phillips screws . 2. Remove 2 allen head cap screws from the door handle . 3. Carefully pry off ...
21 1 2 3 4 5 notice: dependent right hand door shown. 1. Once the door has been removed from the oven (refer to instructions on page 19), remove 9 truss head s.M.S. 10 x ½ from the top, bottom and left side (as shown) from the door panel . 2. Pry the door liner apart from the door panel . This will ...
22 to replace or adjust door latch mechanism 1. Open oven doors. 2. Remove 2 pan head phillips screws. 3. Lift door latch mechanism up and out of door assembly. 4. To adjust latch mechanism , loosen lock nut & and adjust by tightening or loosening adjustment nut. To replace convection oven motor ass...
23 assembly file name jit00012 7 6 2 1 3 8 5 4 5 9 1. Assemble motor mount plate, * insulation, motor mount plate inner together by fastening four flat head m.S. 1/4-20x2½" into the four holes noted on the above drawings. 2. Secure each flat head m.S. 1/4-20x2½" with a flat washer and three hex nuts...
24 main burner, pilot burner removal & door micro switch location 1 2 3 4 to access the burners, pilot or door switch - remove the lower combustion chamber, (not show). This exposes these components, also you will note that the rating or data plate is on the inside of the combustion shroud. For oven...
25 section 4: - c ommon w ire d iagrams.
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